ci: fix pack

Signed-off-by: thxCode <thxcode0824@gmail.com>

Author: thxCode

.github/workflows/pack.yml

@@ -64,6 +64,7 @@ jobs:
             env.BUILDKIT_STEP_LOG_MAX_SIZE=-1
             env.BUILDKIT_STEP_LOG_MAX_SPEED=-1
       - name: Login DockerHub
+        if: ${{ github.event_name != 'pull_request' }}
         uses: docker/login-action@v3
         with:
           username: ${{ env.INPUT_USERNAME }}